Section 338 Canada Suspension Window Refund Pathway: Entries Filed Aug 19 to 21 Assessed at 50 Percent Before CBP Reprograms, CAPE Phase 2 vs 1520(d) vs 174 Protest

The August 18 2026 Temporary Suspension Proclamation (whitehouse.gov/presidential-actions/2026/08/temporary-suspension-of-additional-duties-to-offset-canadian-discrimination-against-the-commerce-of-the-united-states-with-respect-to-alcoholic-beverages-dairy-and-motor-vehicles/) pushed Section 338 Canada from 12:01 AM EDT August 19 to 12:01 AM EDT August 22. Three-day reprieve. The operational risk landing on brokers and IORs this morning: CBP has not yet published a CSMS implementing the suspension, ABI validation tables at some brokers still reference the August 19 cliff, and entries filed August 19, 20, or 21 that carry a 9903.03.12, 9903.03.13, or 9903.03.14 Chapter 99 heading line item may have paid the 50 percent additional duty at entry summary even though the suspension is in force.

That over-collection is refundable. Three pathways run in parallel with different filing windows, different rejection risks, and different documentation burdens: CAPE Phase 2 PSC in ACE, 19 USC 1520(d) reconciliation, and 19 CFR 174 protest at liquidation. CAPE Phase 2 is the correct first-line vehicle for suspension-window over-collections. 1520(d) is not the right pathway for Section 338 errors and is briefly explained below to close the door on the reflex misfiling. 174 protest is the fallback once liquidation occurs.

Why the Over-Collection Happens

The August 18 Proclamation is signed and legally effective, but broker ABI validation tables and CBP ACE validation edits typically lag Federal Register publication by 24 to 72 hours. When a broker files entry summary on August 19 for a Canadian-origin cheese shipment classified under HTS 0406.10.24 and correctly maps the shipment to 9903.03.13 dairy per U.S. Note 51 to Chapter 99 Subchapter III, the ACE validation edit sees the 9903.03.13 line item and applies the 50 percent rate as coded in the pre-suspension edit table. The suspension does not automatically strip the 9903.03.13 line item because the Chapter 99 heading is a valid heading, just not active during the 72-hour suspension window.

Brokers who manually strip the 9903.03.13 line item off the entry filing based on the August 18 Proclamation reading avoid the over-collection. Brokers who file per the pre-suspension coding pattern out of caution (waiting for CSMS confirmation) trigger the over-collection. Both approaches are defensible on the record. The over-collection approach is more common in the first 24 to 48 hours because broker desks are risk-averse when CSMS is silent and prefer to over-collect and refund via PSC rather than under-collect and face a 19 USC 1592 negligence action.

CAPE Phase 2 in ACE: The Correct First-Line Vehicle

CAPE (Cargo Automation and Post-Entry) Phase 2 in ACE launched April 20 2026 and expanded in July to cover reconciliation-flagged entries and rate-assignment-pending entries. For suspension-window over-collections, CAPE PSC is the primary refund vehicle under 19 CFR 141.111.

Filing window: 314 days from entry summary date. For entries filed August 19 through 21, the PSC window closes approximately June 29 to July 1 2027. That is a wide window and no urgency risk on the filing side.

Filing basis: cite the August 18 2026 Proclamation as authority for the suspension, cite U.S. Note 51 to Chapter 99 Subchapter III for the Chapter 99 heading scope, and assert that the 9903.03.12, 9903.03.13, or 9903.03.14 line item was inactive during the 72-hour suspension window and should not have carried duty on entries filed and cleared August 19 through 21.

Documentation package: entry summary (CBP Form 7501), commercial invoice with 8-digit HTSUS and Chapter 99 heading annotation, ABI extract showing the entry filing timestamp, rate-at-unlading evidence per 19 CFR 141.68, and a copy of the August 18 Proclamation attached as authority. Broker should include a short cover letter explaining that the ABI validation edit had not yet been reprogrammed at time of entry filing.

Acceptance rate expectations: CAPE Phase 2 PSC acceptance on well-documented rate-assignment corrections has run at 70 to 80 percent through Q2 2026 per NCBFAA trade advisories. Suspension-window over-collections should score higher on acceptance because the underlying legal authority (the August 18 Proclamation) is unambiguous and the error is a timing mismatch between the Proclamation signature and CBP ABI reprogramming, not a substantive classification dispute.

Why 1520(d) Is the Wrong Vehicle

19 USC 1520(d) provides a post-entry pathway for claiming preferential tariff treatment under a free trade agreement (USMCA, U.S.-Korea FTA, U.S.-Colombia TPA, and similar). The filing window is one year from date of entry. The claim asserts that goods qualifying for FTA preferential treatment paid MFN duty at entry and should be refunded to the FTA preferential rate.

Section 338 duties do not waive under USMCA. The July 20 Proclamations 11046 through 11048 cover goods that continue to originate from Canada under USMCA rules of origin but nevertheless carry the 50 percent Section 338 layer. Filing a 1520(d) claim asserting USMCA preferential treatment on a suspension-window over-collection would not produce the correct refund because the FTA preference does not address the Section 338 layer at all.

The correct authority citation for the suspension-window refund is the August 18 Proclamation and U.S. Note 51 to Chapter 99, filed through the CAPE PSC mechanism under 19 CFR 141.111. Not 1520(d). See 1520(d) vs CAPE PSC vs 174 protest decision tree for the broader post-cliff refund landscape.

Reconciliation entries under 19 CFR 141.1 are a separate mechanism from 1520(d) refunds. Reconciliation is available for entries where the importer flags a specific data element (value, classification, 9802 assembly, FTA claim) for later true-up. Suspension-window over-collections could theoretically be routed through a reconciliation entry if the underlying entry was reconciliation-flagged at filing, but this is operationally cumbersome and adds 21 months to the refund cycle vs the 60 to 120 day CAPE PSC turnaround. Not recommended.

19 CFR 174 Protest at Liquidation as the Fallback

For entries where the CAPE PSC filing window closes (unlikely, given 314 days) or where CBP rejects the CAPE PSC, the 19 CFR 174 protest at liquidation is the fallback vehicle.

Filing window: 180 days from liquidation. Liquidation typically occurs 314 days after entry summary, so the 174 window opens approximately June 29 to July 1 2027 and closes approximately December 26 2027 to December 28 2027 for suspension-window entries.

Filing basis: same authority citations as the CAPE PSC (August 18 Proclamation and U.S. Note 51), but framed as a protest against CBP's liquidation determination that assessed the 9903.03.12, 9903.03.13, or 9903.03.14 duty during the suspension window.

Rejection risk: CBP protest teams are backlogged. Protest resolution typically runs 180 to 540 days from filing. The refund proceeds hit the IOR ACH account only after protest allowance. Working capital impact stretches to 2 to 3 years from original entry.

The sequential protocol is: file CAPE PSC as soon as the over-collection is identified. Wait for CBP acceptance or rejection (60 to 120 days). If accepted, refund lands to IOR ACH. If rejected, file 174 protest within 180 days of liquidation citing the CAPE PSC rejection reason. Filing both simultaneously creates a filing conflict that CBP resolves by suspending the protest until the PSC is dispositioned.

Worked Recovery Example: 500k CIF Quebec Cheese Shipment

Take a 500,000 CIF Quebec cheese shipment classified under HTS 0406.10.24 (fresh cheese, over quota rate), USMCA qualifying, entered at Champlain port on August 20 2026 (mid-suspension window). Broker files entry summary the same day with 9903.03.13 dairy line item because ABI validation edit had not yet been reprogrammed for the August 18 suspension.

Duty assessed at entry:

MFN base rate on 0406.10.24 (fresh cheese, over quota): 1.055 per kg plus 8.5 percent ad valorem for over-quota. For simplicity, assume the shipment is fully over-quota with MFN duty of 42,500 at 8.5 percent ad valorem plus specific rate.

Section 338 dairy layer at 50 percent under 9903.03.13: 250,000.

MPF at 0.3464 percent capped at 634.62 (2026 cap): 634.62.

HMF at 0.125 percent for ocean discharge (if applicable, assume yes): 625.

Total duty paid at entry: approximately 293,760 (with the Section 338 layer).

Correct duty per the August 18 suspension: MFN 42,500 plus MPF 634.62 plus HMF 625 equals 43,760. Section 338 does not attach during the 72-hour suspension window.

Over-collection: 250,000.

Recovery pathway: file CAPE PSC in ACE within 30 days of entry summary, cite the August 18 Proclamation, include the entry summary timestamp showing August 20 filing, request refund of the 250,000 Section 338 over-collection. Expected CBP disposition: 60 to 120 days. Refund lands to IOR ACH account.

If CBP rejects the PSC (unlikely, given the unambiguous legal authority), file 19 CFR 174 protest within 180 days of the December 2027 liquidation citing the PSC rejection basis.

Documentation Retention Under 19 USC 1509(a)

The 5-year records-audit window under 19 USC 1509(a) runs from entry filing date. For suspension-window entries filed August 19 through 21 2026, the records retention window closes approximately August 20 2031. Broker and IOR should retain: entry summary (CBP Form 7501), commercial invoice, packing list, USMCA Certificate of Origin (still relevant even though it does not offset Section 338), ABI extract, rate-at-unlading evidence, the August 18 Proclamation copy, any CBP CSMS published post-suspension, and the CAPE PSC filing package with CBP acceptance or rejection notice.

If CBP audits post-refund and challenges the CAPE PSC basis, the retention package is the record. Missing pieces (particularly the ABI extract showing entry filing timestamp) can defeat an otherwise strong refund position. Broker should confirm the retention package is complete at time of entry filing, not at time of PSC filing.

The suspension window creates a discrete refund cohort of entries filed August 19 through 21. That cohort will run through the CAPE PSC pipeline in September, October, and November 2026. Working-capital return should land in the December 2026 to February 2027 window for most filers. Book the receivable and manage cash accordingly.